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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7b3b60580f907309cbf4d825c6c64855bde3d83ff0c888530f255f3b7a8aca9c' 
  AND token = 'mOJ5EDY1WMnyjA3CqRyFr/d6lyMst7K/JJSjSTRqrH4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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