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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '111173fa5bff7b211d3555ddee34a101818a42923f054919bd4d40d9af987af1' 
  AND token = 'x3sZxsHyVjUcaaNie0YajFWJowZeepiKhaedb29Usjc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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