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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '609b8edf9be9b64685e6b1778a2f8f056f699376de22a89c51b60eb57bc419c0' 
  AND token = 'lTgoX8UaGcYMZ+u2HAWJd0bRvMpEK8WgnLAZ1xIr4vY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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