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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'dc12ea58671c2c351dd50e217883f52cb4a2a676dbcc35a63a6bdd05f794649e' 
  AND token = 'ckmRiC/zasFb8cHOkEjbZq+WtWl9pr1DozMnxDEL1dY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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