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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c27b38ebd41ab57c0070dee720406e1de2b220e336bba0547e5313d11b4b38e6' 
  AND token = 'xIVpsTy5mvXyM/O77kzLzJVjwee4OKY6hFQoF5Wk480=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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