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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b2c5227aca5d4eaefc616132c6445fa88b8e9f6a5b387cf50f552eadce578427' 
  AND token = 'W72ZsVoW8nn0iKp0+GnlofhWKcMUVPRYgeXqarHL4Lk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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