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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b0fea936f6dc00251b86cdf35e7b90da0f7dbc427cf255ad99f01c01a5d17beb' 
  AND token = 'NWl+tc6SHF4wFFu/Np/s8a4MgTchiqpXohUkO9v8XwE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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