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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '04b306d43a2559c7077b5572aa26dc76db265be729ed85eaadec8b2891eb1c90' 
  AND token = 'omzhC6D42SOU7wMQkyRENpKFtGsWWYDyw1dNiZ/Medo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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