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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1d81cc33041167339a7633a4fcea8c5512f2409e1fe1aa18f9c940d3956ecb3a' 
  AND token = 'HDZWq7G9pafE2gEHqgG5fy9YsLZvKoVALDGes7R6QQI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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