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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fa69519bc05c7c6b04cc509b69f870ae6d8c50e5e1d38bbdba9bcf0ffe2e8f44' 
  AND token = 'yCsXSTWlpWCUaxBJePP/9w/5x/wmWXFYFj+ZOdsWcZA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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