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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3b26552d548f0db3a2d47dcbac2b23f613b40334665f10d13537566f5358a3bc' 
  AND token = 'lQcKRQdNmGPF1wICdUX5OWgW7g6qLxl5grjx43Y6CoA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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