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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e2b45b39105032a504642a4e809dcb540bded48ea5aee22969b469a758ff03ef' 
  AND token = 'xfAr3K6bDgZlrp7aqbkS6DHJcO1e6hjbIv/UhpqCQaE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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