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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8b1048d20910e4e2dfe770eed746567e2a5235a546ab9cc6e26d8c1eceb3c3b1' 
  AND token = 'u3dXAxw0C6xYM5eCoIVdCKJmtQxl21Yigbo4eRArdwM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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