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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2d23cf879e52111ad50c5a646a9a0035316c796eb281b6e7c35483d66da7685a' 
  AND token = 'nBoLnb5DCttx+ZlzGhcVH0wedexFwrH2bjyvOXeFaFU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}