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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cc4ce2a350f24b477c30486d64500e792dbe3f7039cdbb4d9fa43714551dfaa4' 
  AND token = 'fDnQfYwhJswx+i3eI87pbt2wH95o9I0w8YDsa43qjBc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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