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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a5ddf99ebfd17c1c938b3405ce48540fedef7e437068d1cbd7b5a56badb7f27c' 
  AND token = 'tv1HlX2c4zcW/YeO1TyJKaBFMgogcjnRbibUywhRLOY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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