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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0d5e26934265c68e9308c159065dbedd6a00e98f9a639da18f8835f30bf6f981' 
  AND token = 'J4nRHV+w2oS7OiE8TfHXK3xeHfNEsIwIKy80XxlrsuA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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