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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '07c84f0b093cd83e7bcb5d451a3faad06eb9fd5de5534edeb4b56de826af2227' 
  AND token = 'mb2UvbHhVLUuR0g2DHDBE4jt84CNtn6TL0kEBYAHFw4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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