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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c8eb127266ecc9d4687cad4854bc3ce943525c12a1945718a92907f6f1d4d3c0' 
  AND token = 'n5uEe4CBdbxkjii/ORkZs7Z2DGvJeaWX6yEyDDXH3KE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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