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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ce0b2dd33fbf6fcdc414199bafc0145fed8f3d5551ace310d7fe331c6c8ac924' 
  AND token = 'BEYBt3NdCvzHQJ04UU+Scp+Las9MOdRioQ5IMbb+frI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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