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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd725548676e51f568e49a5ed94c488a65f2f77dcfc4e9ff561b5b3fce76a9951' 
  AND token = 'N+/wkM1JpZ4buDc5MwCFB1WAKlHShVjP6e6cuod5UHg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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