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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ee57136c0027853be5926781f130abbe66a985d7ade5081ea6e2c9448fd9a21a' 
  AND token = 'u9cyWE/O12jdF4RAfOQSXHtLBZHQ+oLkkbQqUjoUuYk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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