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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4a5242efec2e9df6046d0d15bc55590bd570071d01030cfd3636d6dc8dbab683' 
  AND token = '62lZcaA1XfqXin9T/oIr6W/fDT7PXgaaSD3oXjq8qqY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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