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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '41d19ba350f83516620d9843e06d5c311b917c7ad799e4a36878b4a976ec107b' 
  AND token = 'oty2W4cSUic/SM67n82yR2t55WpIoNjf+S2r0P81C/s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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