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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3dd58f9d455f32e7136534b9042a862f1bab0bbfe2a284a01cdc7c7c02048ee7' 
  AND token = 'jZTn94rndWQUd8phM/F8Tc4v/oKJXsLGEELM86esHiA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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