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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '28610adfdca650e6eab361f8af02db29867e341c853877ab983e04ab26e5c6f1' 
  AND token = 'TLisOvR69AN7sWh2Bz2S3wHhnf9ZUNc7loto+e807jw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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