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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '75b36a1d1661e354272e555d05d0fff92663a6f9a04a22e36e7a9cb24fc7cdae' 
  AND token = 'EJIjVQNVLw8s+QNCdaArdfI3UzD0ff4c8n0y4fs3wX8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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