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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bdc0c6d7c63826ef6c4c10b2f86b7923566b1833282ec646fdaae50069a4eb7d' 
  AND token = 'AHWleW4XwAljVuUlP9qwu6qi3Uicg0yoKx73JCuL3ag=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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