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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0a8c33453f2286cdc07119de8fc9cdc0eb1f5823265fb4207d0abe7d1f759af1' 
  AND token = 'EQQlfoPCmFhwqP5l4KQya3WwWw1O9wKKjX5a1iFHSMo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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