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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '37aa459f83720ee34fd0454ee3e4eb6aa6638bfa8ac7a1825cb0dac9bb8284e7' 
  AND token = 'ZmU4ur/XZbDCAl7M60BQhS3HzPxZ1eIiK1Q++8cQkw0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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