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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fc6a46f136348313ec291bd6ebc521e82ce4ca96c5a852fa150a7f2e249651d0' 
  AND token = 'Q88w+o07b8OdCu4t9X3Q+VlD9bF3q0pT7HYxUSFEvZ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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