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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8fda413971bb4f41c8f5d21217ae813b3b4b67d75f4a63c0dc867570b6c759d8' 
  AND token = 'SX1cCDaIPfFH7PAk5i8ZBSorR7kmMdE8BBymEYItB6A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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