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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '72041e6294ef24ce65db5f849eadc059b41f1b9ffd8cb506f300681550d2fdaa' 
  AND token = 'BZjFYi4h9F179brm2AfgYyA0SxrEGLqAc9UybqpeG8U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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