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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3e9045371ef12261e312ff1d095d066a228d28f92767e4e8759abada507d408f' 
  AND token = 'tZyglXfgDHppEl16l1/p8UM8N8vJgbq1T6HHuG6GRiI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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