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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a40ef7165e8ce8ef0e1335521f3ef3085bb05b16200db59d97df600d4129b0c0' 
  AND token = '4VnQXzvutfOL4VeuCd/MwYvym4XHiRQNkgfqS0UwRUE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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