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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1b15aed92a0028703e5b5966b5c9acd3c24c0d4a26d2820b7c15c5e7acffb611' 
  AND token = 'oOK6KAFY6JXtznRMQmLnmOmj+e0F3Ul17mfMLOezvaA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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