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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f85acc39f44ad9bbaa7e703851c2b25c638921c2f295557c15b80d64586496a5' 
  AND token = '31/ejvNRiMWk7GYWbTVOJ7iTncdyVRFyn0WVK0Ou84I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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