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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3e8583741809a5fb103c6a95276e6692b0777297cd07688aeec039620f245974' 
  AND token = 'e0e68/u3UcFGEo8PWVqL2F8bTUNNwPEI4aoX2UxT128=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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