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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4fe40a8c3d834c1ae843044ad93acd884d9c8ac39e416072622bd4b9fbb4d9f2' 
  AND token = 'py06d8j7OIvcZMwINbSCs2Ks+fFFQRYnak5MSslEFEs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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