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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '23644a21d33068fb4005c6fe4e00875794c261c7c43fe909c4203783fb864e14' 
  AND token = 'L0rHQ+BRzUGccBM6ErwnNBFHfN6SZ9N725JpkZNLqSE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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