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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '03657de10af4fe4a7654a5ee6ac6c53901a6a971b109cc0dcb31403920666674' 
  AND token = '7eNtwOMzPj/KVpKXk2L9AN8Zis5FdQKofTQtyUibsOc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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