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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0ea48a677288b69a53c26ef340729da1f7f0fb661b7792074b43d90de162f07d' 
  AND token = '19dOOEhgzaPc43fMzTcB/Vj6eJrXcr2UGoWNj7kFS70=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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