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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a861e23b8547553684caa1fdb186d2705598fdadd78464b092f91540ab0ec8cd' 
  AND token = 'jyT7tNA80J71IVwipNqzc572MQ60MIA8non/BszMXTA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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