SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a5ba1f3239f9727565c24783f31f060e7e62b66298703d8f4c92198ddf682a1b' 
  AND token = 'uZm2cnZHq5u2RSjcErAZoWQR6jhmIFGsOv2NwwFixHQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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