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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '437eed55bf0eccc446b7befcd7825d59faf0d164d2832cf91f83528bc9d1c890' 
  AND token = 'NseK2PEM0c7iKLYvAEhHzBb6mLDNt6Xkya4fbPKHkwg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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