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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1d4a3354cae89fcb4ff5abb7f16d911c70e5065e3152fcd605c4c924cf9def1e' 
  AND token = '+71H04vWc5pCyaVDwRAwEfQ2/P4hUCgG3giFFbM6E60=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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