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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ea82f08ee3a2a8c7ce7776793ad845392eb4381adc7ed657b9dc238316a064cd' 
  AND token = 'VG5Z2wDkr5hWCmyF5nUYwbPW7Rd0hmW+nY89VvLNUhE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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