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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fc326d3c5ebb4e964ed41a9388905cea37ebaee05c647f4ee9a1ffa15dedf5da' 
  AND token = '3yNXmqmGE0B2w08XLHbCjyMNUhynbgxiEJISOn4zxPg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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