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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '089a7368de9ab7780f0a319c3a68b109fed3084c4a00073db8906176da266cd9' 
  AND token = 'C8GkgUZyPtBkGGitiklT3F7EKYXbEJhO/QuZFHKN+HQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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