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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '50b30ec826e0acda7123b379369f72aac3f500ba03b277a352b5a31a992aabb8' 
  AND token = '5G1wGcnPRzRu6A+9f3cJ/agRGx/K/gkSUs0JgBlO25I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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