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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '940db9b9ee6250add3facec91c816a052008ade1c010e0cf577c4ec88c2f5c02' 
  AND token = 'jDpCTlx+wWAP7ArCn25ujeDwuwvIvS+YeFeJ2RMLE1o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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