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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4fbf3793bbeb52833e53d744b16d4b926be4c0661893e57d12d0393db475b370' 
  AND token = 'dk+CmLoiRzQg49YEyszuHBmPa43M6c/kdwQui89wTdY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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