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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2ec36b39efdf2a12fa31b8a038af106ddb419394020cc3389bf17b9286fd3eee' 
  AND token = '9dPk/GDgyTlOdTzncNIPeNSO9O79wv8/5Bt+31ET4rg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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