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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '47e1be2502eb1ce8320099b08c862bb6bd705b13787b58caf80107e9cbc41645' 
  AND token = 'vcSXjqd+Skm76wF406HhO7+VO0Vj2gqA+J7Yofs2n0s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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