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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0ba7232043cd2d34543099d30c54206d87c9b439ff028b4fd18af5d9abe11106' 
  AND token = 'cjrrmD/rXitfsAC+nf4Fdh0IYkX6VCXyk+HH75RSoAM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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