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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b209650110ab8a5f8998c2108626e25cd097284da936500b5210e2f736dcc519' 
  AND token = '8l1PkocWAapTvxPAJn5MUtQvd93G+z8uIkQNWeEmaQ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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