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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4e62dc2adca5c5c494b5271c4166fef1102efd403389b2d9004d45d8c6a341bb' 
  AND token = '6VlvdndBoCiE5Yz2fScEYNDyH2I+SXlveNfbVdDK2yw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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