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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '54e1e08c854d6d04c6ff9dc910db8b3321fb8fdd816d990ecf306bfebba7bf40' 
  AND token = 'RQJ+/09dshRvBlPHbqb1pf03rBRZaannoG6X9V/EZYc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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