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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'dea04c7d26dd91a2f622c6e265fb737aa909bae4f3d49d33953212321569596f' 
  AND token = '2gdBTsA1cDvn1UXEqWVMiZUwbNZOX5sew2qsK0HAu9M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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