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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7fc4d1d96bd0c3a551f5696584dac4ecb912ee823042de8caf0f5821a6345da0' 
  AND token = 'RjFDQli+TGGjIPIXLhLbXESsJxNaofJXHYF41UUMr54=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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