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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fc7979a58e1cb5c06078e484852fd4674364b0dc776bf226d16e104a22c24a2e' 
  AND token = 'KTVMwwmw/dmdAtoOe5vkeQagk18U0uJKVjdM9jjE7BE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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